• Single Lights Available in Red, Green, Yellow, Blue, or White
  • Units with One of Five User Selectable Lights Available
  • Units with Three Layered Lights Available
  • Light / Horn Powered Directly from ProVu or Helios
  • ProVu Meter Can be Equipped with up to 8 Relays to Drive Variety of Light & Horn Configurations
  • Light / Horn Programmable for Variety of Reset Functions, Including:
    • Silence Horn at Any Time
    • Light Stays on Until Alarm Clears
  • Light Can Be Wired to Flash (Not Available on PDA-LH5C) or Stay Steady On
  • IP 65 Rated
  • 85 dB Horn
  • Operates from -5 to 40°C (23 to 104°F)


Precision Digital offers three different light configurations in its line of Light / Horn devices. The first option is a factory ordered Light / Horn with a color of either red, green, yellow, blue, or white. The second option is a Light / Horn the user determines the light color (red, green, yellow, blue or white) by connecting the appropriate wire. The third option is a Light / Horn with red, yellow, and green layers the user can turn on independently. The light on the Light / Horn can be wired to flash (not available on PDA-LH5C) or stay steady on and the horn is rated at 85 dB. The light and horn can be controlled independently of each other via separate relays on the Precision Digital meter; and since the meter's relays can be reset in a variety of ways, there are several ways the Light / Horn can operate. For instance, the horn can be programmed to silence at any time via the Reset Button or F3 front panel button (on ProVu models), and light to turn off automatically when the alarm clears.

PDA-LH Series


PDA-LH Models

PDA-LH Wiring

A typical way to use the PDA-LH is to program the meter so the horn can be silenced via the Reset Button at any time and the light to reset automatically after alarm clears:

RelayConnected toDefault Reset
1Flashing Light(1)Auto reset
2HornSilence with Reset Button
3User DeviceAs user desires
4User DeviceAs user desires
1 Light can be wired to flash or stay steady on.


PDA-LH5C Wiring

The PDA-LH5C shows one of five possible colors at a time. A typical application might use the green light to indicate everything is OK and the red light to indicate high and low alarms:

1Low alarmRed lightAuto
2All OKGreen lightAuto
2High alarmRed lightAuto
3Low alarmHornLatch
4High alarmHornLatch



Indicate everything is OK with the green light, a High warning with the yellow light, and a High alarm with the red light. The Horn would also sound at both High warning and High alarms and can be manually reset at any time.

1All OKGreen lightAuto
2WarningYellow lightAuto
2High alarmRed lightAuto
4High alarmHornLatch

Dimensions Units: Inches (mm)

Light / Horn Dimensions


PDA-LH Connections

PDA-LH Models

Connections shown for a red light model. For other PDA-LH models, the red wire is the color of the light. Connect the red and black wires for a Steady On light and red and gray wires for Flashing light.

PDA-LH5 Connections


Connect the LED color to the plus supply and the black wire to the minus supply to turn the LED on. Be aware of limitations for applications requiring different color lights for different alarm conditions.

PDA-LH3LC-RYG Connections


Connect the LED color to the plus supply for a Steady On light and LED color and gray wires to the plus supply for Flashing light. The black wire should be connected to the minus supply.

PDA-BUTTON1R Reset Button

Use the PDA-BUTTON1R reset button to silence the horn or turn off the light (9 labels provided).

PDA-BUTTON1R Reset Button
PDA-BUTTON1R Reset Button

PDA-BUTTON1R Labels Provided

Watch the Light / Horn Video


Light Colors:
PDA-LHG: Green
PDA-LHY: Yellow
PDA-LHW: White
PDA-LH5C: User selectable: red, green, yellow, blue, or white
PDA-LH3LC-RYG: 1 layer each of red, yellow, green (consult factory for other colors available).
Light Action: Can be wired to flash (not available on PDA-LH5C) or stay steady on
Horn: 85 dB
Rating: IP 65
Light / Horn Independence: Light and horn can be controlled via separate relays
Power Requirement: 900mW or 40mA at 24V
Transmitter Power Supply: The ProVu's or Helios's internal transmitter power supply is downgraded from 200 mA when it powers the Light / Horn. To determine the total downgrade, add the currents for the light(s) being used and the horn if used. If more power is needed, then consider the PDA1024-01.
PDA-LH and PDA-LH5C Models:
Example: 17 mA (Red Light) + 20 mA (Horn) = 37 mA total current downgrade from the 200 mA supply. Left over current = 163 mA

ColorDowngraded by
Red17 mA
Green15 mA
Yellow23 mA
Blue15 mA
White42 mA
Horn20 mA

Downgraded by each color that is turned on and the horn.
Example: 33 mA (Yellow Light) + 38 mA (Horn) = 71 mA total current downgrade from the 200 mA supply. Left over current = 139 mA
ColorDowngraded by
Red34 mA
Green29 mA
Yellow33 mA
Horn38 mA

Reset / Silence Button: NEMA 4X; may be wired to F4 terminal on ProVu. F3 front panel button can also be used to reset relays.
Reset Button Labels: The Light / Horn accessory comes with 9 pre-printed message labels the user can affix under the red button: RESET, BATCH, ACK, TARE, SILENCE, STOP, START, PAUSE, START/STOP
Light / Horn Mounting connection: M22
Hole Sizes: Light / Horn: 0.875" (22 mm)
Cable Length: 3.28 feet (1 meter)
Operating Temperature Range: -5 to 40°C (23 to 104°F)


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